Rear Wheel Chain Adjuster (LH) for Royal Enfield Bullet 500 / Classic 500 | 1040297/A | Genuine OEM

If your rear wheel alignment keeps going off, your chain can feel “tight-loose-tight”, or the axle adjuster bolt isn’t holding position, it’s time to replace the Rear Wheel Chain Adjuster – Left Hand (LH). Royal Enfield part number 1040297/A is a genuine OEM adjuster used on specific UCE 500 (Euro III spec) Bullet 500 and Classic 500 variants to set chain slack and maintain straight rear-wheel tracking—critical for smooth acceleration, longer chain/sprocket life, and stable handling. 

Unlike low-grade aftermarket adjusters that round off or slip under load, an OEM adjuster is made to the correct thread pitch and profile for predictable adjustment and safer clamping at the swingarm end. This part is the LH (left) side—if you need the right side, the matching part is typically 1040296/A (RH).

Note: Fitment is NOT universal across all Royal Enfields—please match your model/variant exactly (see table) to avoid returns. 

Key Features 

• Genuine Royal Enfield OEM part: 1040297/A 

• Function: rear wheel/chain alignment adjuster (LH) for accurate chain slack setting 

• Helps reduce uneven chain wear and rear wheel misalignment symptoms

• Correct OEM machining/threads for reliable adjustment vs many aftermarket copies

• Ideal replacement if adjuster is bent, threads damaged, or alignment marks don’t match

• Pairs with RH adjuster (commonly 1040296/A) for full set replacement 

• Small-cost preventive part that protects expensive chain & sprocket kits

• HSN/GST reference available in OEM price lists (useful for invoicing) 

Compatibility Table

Confirmed “FITS” list below is taken from dealer parts fiche listings. 

Explicit exclusions (not confirmed, do not assume): Classic 350 (any), Bullet 350 (any), Electra 350/500 India variants, Thunderbird 350/500, Continental GT 535 India variants, all J-Series 350, all 650 Twins, Himalayan/Scram/450 platform models.

Variants

• Side Option (Recommended as variants on one product page):

  • LH Adjuster – 1040297/A (this listing)

  • RH Adjuster – 1040296/A (pair-side part number) 

FAQs 

1. What does a chain/wheel adjuster do?
   It sets rear axle position to maintain correct chain slack and keeps the rear wheel aligned straight in the swingarm.

2. Is 1040297/A for left or right side?
   1040297/A is LH (Left Hand). For the opposite side, you typically need 1040296/A (RH). 

3. Will this fit my Indian Classic/Bullet 500 BS3/BS4?
   Not safe to assume. This part is confirmed for UK/EU Euro III-spec Bullet 500 and Classic 500 variants listed above. Please match your exact variant/VIN before ordering. 

4. Should I replace both sides together?
   If one side is worn/bent or the threads are damaged, replacing both LH + RH often restores symmetric adjustment and easier wheel alignment.

5. Is this genuine OEM?
   Yes—1040297/A is listed as a genuine Royal Enfield spare part by parts-catalog sources.